ID of the record.

<div class="definition">
    Integer, default = null
</div>

If you defined a form that has <span class="argument">.recid</span> and <a class="argument" href="w2form.url">.url</a>
properties defined, the form data will be loaded from the remote data source into the <a class="argument" href="w2form.record">.record</a> object.
<div style="height: 10px"></div>

You can defined it during object creation:
<textarea class="javascript">
let form = new w2form({
    name     : 'form',
    recid    : 10,
    url      : '/server/url',
    formURL  : '/server/path',
    fields: [
        { field: 'first_name', type: 'text', required: true },
        { field: 'last_name', type: 'text', required: true },
        { field: 'email', type: 'email' }
    ],
    record: {
        first_name : 'John',
        last_name  : 'Doe',
        email      : 'jdoe@email.com'
    },
    actions: {
        "save": function () { this.validate(); },
        "reset": function () { this.clear(); }
    },
    postData: [
        param1 : 'value1',
        param2 : 'value2'
    ]
});
</textarea>

Or you can change this property during run-time
<textarea class="javascript">
w2ui.form.recid = 101;
w2ui.form.reload();
</textarea>